[jdk21] RFR: 8309296: jdk/jfr/event/runtime/TestAgentEvent.java fails due to "missing" dynamic JavaAgent

[Erik Gahlin]

8309296: jdk/jfr/event/runtime/TestAgentEvent.java fails due to "missing" dynamic JavaAgent

-------------

Commit messages:
 - Backport 658c3374d88836f5c8745f777e836d502f0ec2ca

Changes: https://git.openjdk.org/jdk21/pull/54/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=54&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309296
  Stats: 38 lines in 1 file changed: 21 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk21/pull/54.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/54/head:pull/54

PR: https://git.openjdk.org/jdk21/pull/54